Oxalic acid

Gunni

.
Mar 16, 2010
5,937
Beneteau 411 Oceanis Annapolis
Do It Best Deale Hardware Store - Wood Bleach (oxalic acid crystal). In the paint section.
 

capta

.
Jun 4, 2009
5,072
Pearson 530 Admiralty Bay, Bequia SVG
Any hardware store or probably Home Depot, etc.
 
Feb 6, 2013
437
Hunter 31 Deale, MD
Tried Lowe's, they didn't have it. It's not on Home Depot or Ace/True Value websites.

However, I just call the Sherwin Williams store up the street in Gambrills and they have plenty of it.
 

JamesG161

SBO Weather and Forecasting Forum Jim & John
Feb 14, 2014
8,020
Hunter 430 Waveland, MS
Look in the ceramic tile area for grout cleaner in a small container with crystals. This is tough stuff! Rubber gloves and eye protection are recommended.
NEVER Mix Bleach with it! Chlorine gas was be released!
Jim...
 
Mar 1, 2012
2,182
1961 Rhodes Meridian 25 Texas coast
Almost any Ace hardware store, And probably Home Depot too- It's sold as "Wood Bleach" The brand I get is Savogran, in crystal form. It'll probably be inn the paint section
 
Jul 7, 2004
8,534
Hunter 30T Cheney, KS
Check out some of the toilet bowl cleaners. That's what I used to clean up a grungy waterline on my hull