Each step will have an explanation.
Steps in uppercase letters is a must.
1. Pressure washer - used to blast off dried up gunk and mud stuck on the car. This is so you dont contaminate your sponge. Pressure washers save a lot of water.
(my washer uses 360 Litres/ hour. That means 3.6 Litres in 6 minutes.
I only use the washer for 6 minutes anyway.)
2. If you got no pressure washer, use a hose and try your best to remove the stuck on gunk with your palms. Human palms can feel dirt alot better than a sponge would. And please, dont rub and scrub, just lightly run over the dirt.
3. ALWAYS USE 2 BUCKETS. 1 BUCKET FOR SOAP WATER, 1 BUCKET FOR PLAIN WATER. RINSE OFF THE SPONGE AFTER EACH CAR PANEL IN THE PLAIN WATER TO REMOVE DIRT. THEN GO BACK TO THE SOAP WATER.
4. ALWAYS BE LIBERAL WITH THE SOAP. lubricity is the key. plain water is like sandpaper to a car.
5. DO NOT WASH IN CIRCLES. You dont want circle scratches or swirls to form.
6. when you pick up more soap, do not slosh your sponge on the bottom of the bucket. only take the top part. (any dirt has dropped to the bottom)
7. Dont use the last 1/5 of your soap bucket. (any dirt has dropped to the bottom) I know you waste a bit of water here, but you can use this for something else. washing your tyres for example.
8. NEVER EVER RUB ANY STAINS OR STUCK ON DIRT WITH THE SPONGE. YOU WANNA DIE AH!? SMACK YOU THEN YOU KNOW.
9. ALWAYS RINSE the SOAP OFF WITH PLAIN WATER to get soap off.
10. ALWAYS DRY YOUR CAR AFTER THAT TO PREVENT WATER SPOTS.