Drop your van off pick it up with hot water lol,you can’t ask for anything simpler than that 😊.
To see any benefit of hot water it needs to be hot firstly not warm,someone said on here the benchmark temperature for better quicker cleaning results are between 55-70 degrees I think I’m right in saying,that’s very true.
Anything lower will obviously keep you working in cold weather but as far as cleaning results go on ground on dirty and geeen PVC it needs to be that sort of temperature above to be worth it.