You can find Vinyl siding cleaner concentrate at the big box stores and most hardware stores. Same with deck cleaners. Myself, i've always used a bleach solution in my gas operated washer for cleaning the Vinyl siding and deck. After i finish the cleaning i run straight water through the pressure washer to clean/flush it out. Been doing this for about six years with the same pressure washer. Although not recomended by the manufacturer to use bleach in the machine.

Nod,

Thanks for the response, that's what I've decided to do also. Was looking at the various "cleaners" at a hardware store today paying particular attention to ingredients therein. A simple bleach/water solution flushed out after use can't be any worse than those are. In fact, a lot of them listed chlorine which is bleach?

Thanks again,

Ev

The reason bleach is not a good idea for your pressure washer is because as it runs through the pump it damages the seals. The cleaners that contain small amounts of bleach will also have buffer chemicals to protect and lubricate the seals in your pump.

I found a good guide to pressure washing siding that I've attached; they also have good info on power washing decks!

Here is a link that might be useful: How To Clean Siding With A Power Washer

Good link!

What I ended up doing was what I've done in the past, just used a pump up garden sprayer with a 3/4 cup bleach to a gallon of H20. By the time I was finished there was "green water" running down the siding. If we get some sun, that and time will remove the rest. If not, I certainly know how to use the pressure washer on the siding. :-)

Thanks,

Ev