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which specific one do you recommend/have ? is 2L enough ?
I had had the pump sprayer MarkH linked , and the pistol control, and tubing joints were not so good.
Once you have have connected, fired up theQuattroKarcher, might as well use it for foam too ? unless you are going buckets for rinsing.
Magifoam is a fantastic choice, no need to return anything, cookeh is just being a bit of a BH fanboy.