How should I go about setting up for soft washing given my current equipment?

[TexasPressureWashing]

I recommend a lot of reading. It’s been talked about a lot on here and recently it’s not recommended to use a 12V for soaping and your PW for rinsing. Downstreaming is the way to go. There are also several threads discussing Canada supplies.

Canada Supplies Princess auto detergents - #43 by Rnewman

12v soap and PW rinse question and discussion. Gotta search the information is here.

Fatboy to soap, PW to rinse... why doesn't everybody do this?

big drawback of soaping houses with a 12v is you have to mix a barrel or tank of soap. That takes much longer than mixing a 5 gallon concentrate to downstream out of. We’ve gone back and forth 10 different ways, but when it comes to washing large complexes we just run four 5.5gpm pumps each downstreaming and rinsing.