First, read the English article below.

Don’t use a strong jet of water from the hose, as this can rub grit over the paint and scratch it. Try to aim the jet of water downwards on all surfaces. Aiming upwards around windows may cause water to dribble into the car if there are flaws in the rubber seals. Since the wheels of your car are often the dirtiest part, it’s a good idea to wash them first, so that dirt rinsed off of the wheels won’t land on an already-clean part of your car. Use a long, skinny wheel-brush for cleaning the openings of the wheels. If the wheels are already glossy and clean, instead use a sponge or a mitt to clean them just as you would the car body after hosing off as much of the extra dirt. Before you begin scrubbing the surface of your car, soak a large wash mitt or sponge in the soapy water, being certain to wash out any dirt in it, and begin applying it to the car. Do not use a brush on the car body, because this may leave little scratches.  Mitts with long, dangling strands do not push grit onto the car as hard. This type of mitt is preferable, as it’s less likely to scratch the surface. They should still be rinsed, then dipped into the soapy water often. Mitts, unlike sponges, can also be washed in washing machines to remove all the grit. Circle around the car several times, washing lower areas with each round. Washing the car from the top down will allow soap to drip over lower sections of the car while you’re still washing higher sections. This will prevent you from having to wash the same sections twice. If the car is very dirty, let the soap and water do the work. Make multiple passes and avoid excessive scrubbing at dirt on the car, as this could scratch or damage the paint. Bird droppings and bugs can damage the paint, and extra care should be taken to remove them while washing the car. Get them off as soon as possible using a damp rag if you need more scrubbing power than the wash mitts can provide. Soften bugs by dabbing with a sponge that is loaded with warm water, then let the water soak in and scrub the bug... 

Now, please write a short abstract for it in Vietnamese. Abstract:
Dùng vòi nước phun để làm mềm và bong đất cát bám trên ô tô. Rửa trước bánh xe. Dùng găng tay lớn để rửa xe. Rửa xe từng khu vực một, bắt đầu từ trên nóc xe. Cọ rửa phân chim hoặc xác côn trùng dính trên xe. Giữ sạch găng tay. Xả nước lại từng khu vực một sau khi rửa xà phòng. Giữ ướt toàn bộ xe khi đang rửa xe. Rửa phần dưới xe sau cùng. Dùng bàn chải nhựa cọ rửa thành lốp xe. Xịt vòi nước vào gầm xe.