Before you start painting with your new color, you'll need to clean the surface so that paint will better adhere to the wall. We've got something that can help you clean those walls quickly, without too much effort. We advise taking a sponge and trisodium phosphate cleaner (or TSP substitute) to wash off all that extra dirt. For something even less expensive, buy TSP concentrate and mix with water - you can get a 16-oz box for about $5.

TSP can be used on all of your woodwork. It can even be used to clean grease from kitchen walls, remove hairspray in bathrooms, an take off fingerprints around light switches. To avoid TSP solution making contact with your skin, wear rubber gloves and turn up the cuffs to catch the drips. 

For more painting how-tos check out Family Handyman - Painting 

I think for painting to be successful you have to pay this kind of attention to detail and that has been a key feature of places like <a href="http://www.atlantapaintingmgt.com" rel="nofollow">atlanta painting company</a>. A lot of people try to skip the step of cleaning and that can be a huge mistake.
Tsp is wonderful and very effective stuff but spoke is wright it can be very hard on you skin and terrible for the water supply. Phosphates were banned from laundry and dish detergents in the early seventies. When gets into a water supply it promotes the growth of algea, In large enough quantities it can kill fish and alot of other aquatic life so use it sparingly.
While hinted at in the 'article' TSP is nasty stuff to skin. DO NOT LET IT TOUCH YOUR SKIN. Gloves are a 100% must for this stuff.
I recently used a TSP solution to clean a couple nasty carpet stains. It worked great.
Great advice tip! Using tsp will indeed quickly clean all the dirt that you want to remove.

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