My vinyl siding is turning green from mildew and I have to clean it up this weekend.

I let a friend borrow my pressure washer at the beginning of the summer, and he's out of the country for awhile. I'm working that angle to try and get it back.

I called for a rental and found that it's pretty expensive to rent one, even for a few hours.

Are there any products out there that can you can spray on and rinse with a hose? These stains are 20+ feet up, so I'll bite the bullet on the tool rental before I get up there to scrub.

My dad recommended giving Jomax a try. Any experience with this?

4 Answers 4


Wouldn't have believed it if I hadn't seen it. I wish I took before/after pics.




Clorox Outdoor

Clorox Outdoor

Put in a garden sprayer designed for bleach according to instructions on Jomax:

  • 3/4 cups Jomax
  • 2 1/4 cups bleach
  • 13 cups water


For 75% of the siding, I applied the mixture, then rinsed after 5 minutes. A number of sections needed a second application, and the worst section took three.

I rinsed using one of the "fireman" nozzles on my hose, just so I could get it up to the eaves:


I did try just spraying the mildew with the nozzle...worthless. "Firemen" should sue for defamation.

Anyway, I'm thrilled. Probably took 25% longer than last year, but I wasn't dripping wet either :) I'll get a power sprayer for next year, but I'll definitely stick with this; it looks much better than what I get from pressure washing alone.

  • 1
    just want to add I just used this on my Azek vinyl decking and it worked great.
    – Doug T.
    Commented Aug 7, 2011 at 20:07

Jomax is good. Make sure the area is dry before using it, or you wasted your money. Use a pump sprayer, start at the bottom and work your way up. Let stand for 5 to 10 minutes. Rinse off with a hose or a pressure washer. If you need to reapply, make sure the surface is dry first.


Jomax and bleach worked for me too. The north side of my taupe siding house was nearly solid green. I sprayed the mix on, let it sit for about 8 minutes, then worked it horizontally with a long handled car-washing brush and let it sit a few more minutes and rinsed it off with the hose. It's nearly perfect. I'm going to go over a few sections that were very thick with growth again but from 20 ft you couldn't tell that it wasn't perfect.

One gallon of the mix covered about 10' X 20'

The brush work required a good bit of sweat equity but I think its only required because I let this get so bad. I'll follow up with a post after I clean the sides that are only dirty (no green stuff growing). I think that spray and rinse will do it.


Go to a website call Sidingswab.com. They have a tool that mounts on an extension pole and you order the cleaning pad to fit the profile of your specific siding. Works great.

  • 1
    If you are affiliated in any way with the product that you linked to, you must disclose that. Please see the expected behavior, product support and promotion pages in the help center for more information.
    – Niall C.
    Commented Jul 20, 2015 at 3:14
  • I've simply taped a brush onto the end of a long pole and done the same. Commented Sep 25, 2019 at 16:35

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