In a clean bucket, mix 50ml of shampoo with 500ml of water. 

Then, fill the rest of the bucket with water. 

Use a hose to thoroughly rinse off any loose dirt or debris from the van. 

Use a good quality sponge soaked in the shampoo solution to wash the van. 

Avoid using hard brushes, as they can cause swirl marks on the paint. 

After washing, make sure to thoroughly clean the sponge to keep it in good condition. 

Use a chamois to dry the van completely and avoid water spots. 

Always wash the van in the shade to prevent streaking. 

Do not let the shampoo dry on the surface of the van. 

Ensure the surface panels have cooled before washing the vehicle.