Pressure washer advice please :)

desdad

Hi All

Hopefully you guys can point me in the right direction, thanks in advance......

My outside walls are painted white and over the years green grime has built up on the walls which don't see alot of sunlight and/or are behind plants. I've thought of buying a pressure washer to see if I can remove this rather than painting all the affected walls.

Before I do, I'd like to know from your experience whether this will do the job as I'd rather not buy the kit and then realise I have to paint after all! If so, which/what spec of washer do you recommend and what detergent?

Thanks for your help.

keystone

There's a hosepipe ban you know. :cool:

Scrub/Wash it off with bleach in water, then apply stabiliser (if needed) then masonry paint.

Cheers

desdad

thanks keystone, there's no hosepipe ban in my area, don't worry

i've tried scrubbing but doesn't all come off unfortunately.

ColinFishwick

You need a mould killer you can also get paint that has mould inhibitor in it. Zinseer do such a product

http://www.zinsseruk.com

Bleach can kill mould too you get mould because of lack of light. I get it on a flat roof and I use oxygen bleach to kill it off

desdad

thanks Colin. Do you think applying bleach solution and pressure washing will clear it?

Raggie

This may or may not work for you but:

We had a problem with green mould on the outside render, to remove it I used an engine degreaser I had in the garage.

Figuring if it doesn't remove the paint from the engine bay of the car it is unlikely to damage the wall.

The mould instantly dissolved and using a stuff brush I was able to remove it completely.

Only MSE if you already have the cleaner though.

BertieUK

We live in a detatched bungalow that we bought 3 years ago and parts of our wall was similar to the problem that you have, with patches of mould where the masonry paint had worn through to the rendering.

I washed the wall down with my Karcher K 4.6 pressure washer and all the unsightly mould was removed.

Then I painted the wall with a Sandtex Masonry Paint that contained a mould inhibitor, later I will give it a second coat.

Good luck.

BobUK

desdad

thanks for replies.
Raggie, I haven't got engine degreaser, what was name of what you used?

Bob, did you use a detergent with your Karcher, if so what was it?

Thanks

BertieUK

Desdad.. I used the standard Universal Patio & Deck Pressure Washer Cleaner. I got it from Homebase.

Karcher have one similar RM 555 profi but it can be quite expensive.

Regards

BobUK