The two bucket method: 20 questions answered

A way of washing a car with one bucket of shampoo and one bucket of clean water. You rinse the mitt in the clean water after every panel, so the dirt you remove does not go back into the shampoo or onto the paint. Our two bucket method guide has the full routine.

WASH holds water and shampoo. RINSE holds clean water. The mitt goes from WASH to the panel, then to RINSE, then back to WASH.

It removes the most common cause of them, which is grit being carried back onto the paint in dirty shampoo. It cannot remove swirls that are already there. That takes polishing.

Only if nothing used goes back into it, as with a fresh mitt for every panel. See one bucket or two.

Twenty litres each. That covers a grit guard with plenty of clean water above it. See what size bucket you need.

The method works without them and works better with them. If you only have one, put it in RINSE. See do grit guards work.

Only if your wheel brushes or wheel mitt get rinsed in a bucket. Then they need one of their own. See the three bucket method.

No. Any two clean buckets count. Mark them WASH and RINSE so they never get mixed up.

Follow the label. At 1:200 it is 100 ml in 20 litres of water or 50 ml in 10 litres. The dilution ratio calculator covers any bucket.

Yes. Rub it against the grit guard in RINSE, squeeze it out, then reload it in WASH.

Whenever it looks cloudy. On a lightly soiled car one bucket lasts the whole wash. On a very dirty car, change it halfway round.

From the top down. Roof and glass, bonnet and boot, upper doors and wings, bumpers, then lower doors and sills last.

Straight lines with light pressure. Any fine marks left by straight passes are far less visible than round swirl marks.

Swap it for a clean one. Rinsing is not enough. See a dropped mitt is a dead mitt.

A deep pile mitt or pad. A sponge holds grit against the paint. See wash mitt or sponge.

Yes. Snow foam removes loose dirt before you touch the car, so there is less for the mitt to pick up. Less is not none.

Yes. Loosen the dirt with a pre rinse from a pump sprayer and rinse with a watering can. See our bucket only routine.

Winter is when it matters most, because the dirt is grit and salt. See the two bucket method in winter.

Yes, with a few changes to the order and to where the water goes. See how to wash a motorbike.

Yes, and it matters even more there, because a matt finish cannot be polished. Use the Delicate formulas. See how to wash a matt or wrapped car.