Pressure washer chemical dilution rate

[Vinpetrol]

Just bought a Karcher HDS 5/11UX hot washer . More for cars and vans than plant as I have a lavor hot washer for plant.
It’s a compact washer and it has a wee hose that you drop into a chemical bottle to use chemicals .
I’ve been using Jennychem TFR non caustic and wax in my lavor undiluted as it has its own in built tank and that seems to work fine .

not sure with the karcher wether I should be diluting the chem before using with the karcher . Anyone any ideas ?
Ive also bought a foam lance attachment for it but that hasn’t come yet . Are they any good ?

 

[doobin]

Don’t waste your time. Just wait for the snow foam lance.

The whole point of tfr is that it needs to sit on the paintwork for a while to loosen dirt before you wash it off. Introducing chemical to the water flow is for things like disinfectant or moss killer when doing patios.