Snow foam and detergents.

[VinnyTGM]

Firstly, do these affect your wax protection any stronger than hand wash additives?

And secondly, to get the snow foam do you need a specific type of lance or attachment?

[edgasket]

you need a foam lance with the specific connector for your pressure washer, there are different foam washes available, but generally I think they're okay on your wax.