You won't go wrong with Tech-Cleans machines we have had one for 5 years and it has been great, still using it. As far as drian jetting with it, I would say no, it might handle small blockages, but you don't have the Lts per min or PSI to handle nastier stuff. As far as grafitti goes heat and the right chems is the way to go, some guys on here do, do it with cold water so they might be able to give advice.