i use the plumbing Anti-freeze. lower in cost and works great. I pressure wash most of the winter and before shutting down machine ....suck it full of the anti-freeze and good till the next night.
You can also save the antifreeze and recycle most it.
Hi Firescooby
Before you even think of buying equipment....do research first. I would read everything you can first....anf you will be then able to answer the questions you asked.
A good hot water unit...plus trailer....plus reels...plus nozzles...plus...plus....adds up to a lot of money...
One thing you can try to clear the hose... is too lay the hose out and then insert an electrical fish tape and that should clear out what is in there.
Good Luck