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Flat washers may be used on either the bolt side, the nut side or both sides of the fastener. Flat washers help to distribute the force of tightening the nut by increasing the surface area. They may also be useful as spacers when a bolt may be a bit too long for the job. Lock washers are typically used on the nut side of the fastener. The most common type of lock washer is the split coil washer.
A pressure washer is the ideal tool to clean and sanitize large concrete surfaces, and most user-friendly models can be operated with little effort. All of the necessary materials, including the pressure washer, can be bought or rented through your local hardware store.