Article: Before wearing your white shoes, you can apply a stain repellent to them to keep them clean. Shake the bottle, then spray a thin, even layer over the entire shoe. Repeat on the other shoe. Don't forget to spray the soles and laces too, if applicable.  If your shoes are made out of leather or suede, purchase a leather stain repellant. If your shoes are made of canvas or mesh, most types of stain repellents will work, such as Scotchguard. Once the stain repellent has dried completely, you can use a water repellent to further protect your shoes. Shake the can or bottle, then spray the entire shoe in a thin, even layer. Repeat on the other shoe and let the product dry thoroughly before wearing them. If the stain repellent you used is also a water repellent, you can skip this step. Once applied, the stain and water repellent will only last for a few weeks. Make sure to reapply the repellants every few weeks to ensure your shoes stay stain-free.
Question: What is a summary of what this article is about?
Choose a stain repellent formulated for your type of shoes. Apply a water repellent to protect your shoes from rain and snow. Repeat the process every few weeks.

Problem: Article: The pitch of a theremin is controlled by creating a circuit between a variable oscillator and a reference oscillator, which should be available at specialty electronics stores as individual units. Each should be tuned to the same frequency, ideally in the middle of the low frequency radio range.  The pitch-reference oscillator should work around 172kHz, used in conjunction with a 10k potentiometer. The signal this oscillator creates should be fed into the mixer with screened cable. The pitch-variable oscillator should also work around 172khz, and will be affected by the stray capacitance of the reference unit. Potentiometers need to be wired into the circuit to make the relationship of your hand movement to the change in pitch more linear. Without them, the instrument's pitch be almost impossible to control, changing wildly with only a microscopic movement of the hand. Using screened cable, wire the circuit of the pitch control components into the antenna when you're finished. When playing the theremin, your hand changes the capacitance of the antenna, which will change the frequency of the variable oscillator. Essentially, you're sending the signal into the antenna to be manipulated manually. This should also be in the low frequency radio range and carefully tuned, operating somewhere in the neighborhood of 441kHz. This signal will be influenced directly by the volume antenna, manipulating it by hand. A 10k trim potentiometer needs to be installed to enable the operator to tune the theremin appropriately.  Send the output of this variable oscillator into a volume resonant circuit. The output will be a DC voltage that varies according to the output of the variable oscillator.  Tuned correctly, the oscillator frequency will match the tuning of the volume-resonant circuit as the operator's hand approaches the antenna, causing the signal to cut off gradually. In other words, the closer the hand to the antenna, the quieter the sound. The purpose of the mixer is to compare the frequency of the variable oscillator with the reference frequency. The output will be an audio signal between 20Hz and 20kHz. Assembling the mixer is the simplest step in the process. Fed with two slightly different frequencies from the oscillators, the mixer will produce an output with a complex waveform, giving it the distinctive warble we associate with the sci-fi sound of the theremin. The output actually contains two distinct frequencies, which require the need of a low pass filter, that is two 0.0047uF capacitors and a 1k resistor, used to extract the output and boost it into a listenable range. Route the outputs of the mixer and the volume resonant circuit into a voltage-controlled amplifier. The voltage from the volume resonant circuit changes the amplitude of the audio signal from the mixer, helping to boost the sound and control the volume of the instrument.
Summary: Connect the pitch control. Connect the variable oscillator to the pitch antenna. Connect a variable oscillator to the volume antenna. Feed the output of each oscillator into a mixer. Route the signal from the mixer into an amplifier.

Use a washcloth with some mild soap (dish soap is fine) and wash the surface of the tire, then spray it off with a garden hose. Soap and water will clean your tires without stripping away valuable antioxidants that protect your tires. Keeping your tires clean will help the fungus responsible for dry rot from spreading. once a month. After cleaning your tires, apply a few drops of water-based tire dressing to a cloth or sponge, then cover the surface of the tires with the dressing. Wait 5-10 minutes before driving, since the dressing needs time to stick to your wheels.  You can get tire dressing for $5-25 (£3.57-17.86) from most auto stores. It's sometimes labeled as "tire shine" or "tire care." Tire dressing shields your tires from UV rays, one of the main causes of dry rot. ake sure your tires are fully inflated. Check the air pressure in your tires every time you gas up. If your tires don’t have enough pressure, dry rot will be all the more dangerous, and could lead to a blowout. Replace old tires when the tread is wearing thin. Not only are older tires dangerous (because their tread is bare), but they're also at a higher risk of dry rot.  If you drive a car, truck, or SUV, you can gauge this by sticking a quarter into one of the grooves of the tire. If the top of George Washington's head is flush with the top of the tire, it's time to start shopping for tires.  For a larger vehicle like a semi-truck, use a penny. If Abraham Lincoln's face is completely visible, it's time to replace your tires.
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One-sentence summary --
Clean your tires with water and mild soap once a month. Apply a tire dressing . Replace your tires when they're too bare to grip the road.