[AC Pressure]

I have at last bought a water tank to fit in my van plan is to do graffiti removal and domestic drain jetting , now i only have a cold water pressure washer at the moment it is a PT250E from Tech-Clean which i plan to run from the back of my van.
Is it possible to do a good job of removing graffiti using just chemicals and cold water.
If so what are the best chemicals to use with cold water
is it worth me buying a second hand hot water pressure washer and a generator.

[BDCS]

Yes it is possible but you use more chemicals. I have the same machine as you amongst others and just use a hot box when I need hot

[AC Pressure]

I was looking at buying a hot box but for what they cost i could get a good used hot water pressure washer would this be a better option
Where do you buy your chemicals from 

[BDCS]

I use selden chemicals