jagi00 Posted August 23, 2014 Share Posted August 23, 2014 Can anyone recommend a locally available chemical solution to clean a large driveway and pavement which is covered in black/green mould. I could use a pressure washer but it would take forever. Link to comment Share on other sites More sharing options...
ramrod711 Posted August 23, 2014 Share Posted August 23, 2014 I have a pressure washer that has a reservoir in the wand. I fill that with bleach, spray it on, wait a few minutes and wash. It isn't perfect but it's a lot easier than just pressure washing with water. I'll be watching to see if someone knows a miracle chemical that works and i'll try it. 1 Link to comment Share on other sites More sharing options...
DaamNaam Posted August 23, 2014 Share Posted August 23, 2014 Homepro stock a chemical such as this. Not cheap though, import. Link to comment Share on other sites More sharing options...
CMKiwi Posted August 23, 2014 Share Posted August 23, 2014 Ive used a 3M product called Heavy Duty Cleaner. Its suppose to be for cleaning bathrooms etc but Ive also used it on concrete floors. I believe its got phosphoric acid (Or an acid like that) as an active ingredient and thats what reacts with the concrete.... Dont get it on any cuts as it stings like hell; it is strong stuff which is suppose to be diluted but I use it straight on concrete that has algae on it and use a stiff bristle broom to loosen up the heavy areas. After about 5 minutes I simply hose the area down. 5 litre bottle in Macro is less than 300 baht from memory. Link to comment Share on other sites More sharing options...
Maejo Man Posted August 23, 2014 Share Posted August 23, 2014 15% Hydrochloric acid is the best concrete cleaner, as long as you don't wash it off onto your lawn. Hardware shops on Sidonchai have it as do swimming pool companies. Link to comment Share on other sites More sharing options...
jagi00 Posted August 23, 2014 Author Share Posted August 23, 2014 15% Hydrochloric acid is the best concrete cleaner, as long as you don't wash it off onto your lawn. Hardware shops on Sidonchai have it as do swimming pool companies. Yes, hydrochloric acid will work but I was hoping to find a cheaper solution - if you have any more of that 'vintage' wine that might do the trick...... 1 Link to comment Share on other sites More sharing options...
Maejo Man Posted August 23, 2014 Share Posted August 23, 2014 15% Hydrochloric acid is the best concrete cleaner, as long as you don't wash it off onto your lawn. Hardware shops on Sidonchai have it as do swimming pool companies. Yes, hydrochloric acid will work but I was hoping to find a cheaper solution - if you have any more of that 'vintage' wine that might do the trick...... lmao.... Hell you can't get much cheaper than hydrochloric acid. 1 Link to comment Share on other sites More sharing options...
xen Posted August 23, 2014 Share Posted August 23, 2014 Pool chlorine . mix in hot water leave for 10 minutes and hose it off . Don't sniff it and don't wear your Sunday best clothes. Link to comment Share on other sites More sharing options...
Inepto Cracy Posted August 23, 2014 Share Posted August 23, 2014 5 Liters of 5% vinegar spread evenly over the entire area, wait 30 minutes then spray it off with the high pressure washer. Works a treat and not expensive at all. Link to comment Share on other sites More sharing options...
paulchiangmai Posted August 24, 2014 Share Posted August 24, 2014 15% Hydrochloric acid is the best concrete cleaner, as long as you don't wash it off onto your lawn. Hardware shops on Sidonchai have it as do swimming pool companies. Would hydrochloric acid work on pebble dash concrete or would it loosen the stones? Link to comment Share on other sites More sharing options...
Maejo Man Posted August 24, 2014 Share Posted August 24, 2014 15% Hydrochloric acid is the best concrete cleaner, as long as you don't wash it off onto your lawn. Hardware shops on Sidonchai have it as do swimming pool companies. Would hydrochloric acid work on pebble dash concrete or would it loosen the stones? That's exactly what is was used for in Australia by pool companies, and no it didn't loosen the stones. Link to comment Share on other sites More sharing options...
transam Posted August 24, 2014 Share Posted August 24, 2014 Pressure washer does it. Nooooooooo chemicals............. 1 Link to comment Share on other sites More sharing options...
eeeya Posted August 24, 2014 Share Posted August 24, 2014 Careful with your hydrochloric concentrations or you'll eat the concrete. Plus the grass doesn't like the runnoff either Link to comment Share on other sites More sharing options...
Sparkles Posted August 24, 2014 Share Posted August 24, 2014 Pressure washer does it. Nooooooooo chemicals............. And remarkably cheap to buy at Home Pro,Global House etc when you run it up against buying chemicals and inhaling same. No point doing any cleaning until rainy season has finished otherwise you will be doing it twice. Link to comment Share on other sites More sharing options...
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