i just got this one from amazon last week. used it this weekend with my sun joe spx3500. works good
https://www.amazon.com/dp/B08D6K21M3
this was at about half setting. it can get much thicker than this. i used chemical guys mr pink.
https://i.imgur.com/LytioxY.jpg
https://www.amazon.com/Chemical-Guys-CWS_402-Super-Shampoo/dp/B071RKWXKV
Ordered those side storage covers.
I also ordered this USB C cable for when my daughter is using my wife's iPad - already have one for my son and they can't even share charging cables...
Also got some waffle weave drying towels after I found that my regular microfibre towels aren't too great at drying up the car after washing.
And I ran out of car wash soap, so ordered some Mr. Pink too.
Mult-gift set of a grit guard, large waffle-weave micofiber towel, and 1) some 2) good 3) soap
Stubby antenna because the stock one makes the truck look like an RC car