How To Clean Austin Limestone

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12-16-2007, 08:09 PM

155 posts, read 468,910 times Reputation: 97

Our home has a limestone exterior and I've noticed some areas are starting to look a little discolored. This is mainly closer to the ground in spots where it may have a little more exposure to to water/rain. Is there a way to clean the stone that doesn't do any damage? I would think it probably isn't the best idea to power wash it, but was wondering if there is some sort of solution or spray that might help. Any thoughts or suggestions would be appreciated.

12-17-2007, 06:05 AM

achtungpv 2,237 posts, read 8,452,117 times Reputation: 951

If it's mildew or mold, try JoMax (sp?). It's at Home Depot with the deck water seal. You spray it on and spray it off. Works really well.

12-17-2007, 08:15 AM

HappyTexan Location: Great State of Texas 86,067 posts, read 78,783,608 times Reputation: 27668

Plain old Clorox bleach works well too. I use it on my porch floors (cement) to remove the clay stains. I dilute it some though with water.

12-17-2007, 10:22 PM

155 posts, read 468,910 times Reputation: 97

Yes, it is the grayish and/or greenish mildew-type stains. Thank you both for the suggestions. I'll have to give it a try.

12-17-2007, 10:26 PM

Mike78613 Location: Up in a cedar tree. 1,618 posts, read 6,248,192 times Reputation: 563

Dilute w/ Oxy clean w/ spray bottle and squirt , squirt. then Power wash it w/ gentle power!!

12-18-2007, 07:53 AM

10scoachrick Location: Avery Ranch, Austin, TX 8,877 posts, read 15,379,883 times Reputation: 3893

Careful not to nuke any nearby plants. Hose them down with water first or cover them. Don't let any bleach solution dry on the limestone...makes it tougher to get off. You might try one of the 'oxy' type cleaners...I believe one is specifically formulated for outdoor cleaning. Here in ATL, the water crisis means we can't clean our own outdoor projects...only a pro can pressure wash, etc. Sure would be nice to have some water! Sorry Mike, didn't see your 'Oxy' suggestion.

05-04-2014, 09:03 AM

jackdon 136 posts, read 293,968 times Reputation: 76

I cleaned my limestone rocks with bleech, and it removed the black stains fine. Now I'm seeing another problem in the smaller 6x6 stones, some that I cleaned and some that I didn't clean. The larger stones do not have these brown holes appearing in them. See pic. Attached Thumbnails

05-04-2014, 10:19 PM

JohnA151 Location: KYLE TEXAS 431 posts, read 434,943 times Reputation: 282

I use bleach dilute it down in a bucket, brush in on with a long handled broom then hose it down works like a charm. usually do the driveway at the same time .

05-06-2014, 12:48 PM

Milasuccaci 16 posts, read 42,084 times Reputation: 19

i applied bleach to my lime stone at my house.. and it now looks like the stones just were in from the quarry, like new.. try it.. it works like a charm - just take a brush and bleach mixed in water - just brush the stones.. and viola.. you got it all new

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How To Clean Austin Limestone

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