Next time your hands are really dirty and you go to wash them,
look what happens. Are they clean before you rinse them? Or is the
dirt still there?
Would it be different with your wall?
You're paying money for paint, you're investing your time.
The amount and quality of the prep work will determine how long before
you must do this again. If you wash and rinse thoroughly and use a
high quality paint, it could be a decade or two before it needs
painting again. If you scrimp, it could be next year when it needs
BTW, when I use TSP before painting, I use a solution three
times stronger than specified on the box. I also find the job is
easiest using a sponge mop--preferably with a new sponge. If the
surface is really dirty or the room is a bathroom or kitchen, I wash
and rinse at least twice. Sometimes more.
cleaning agent, and if you use a floor (sponge) mop, the work will go
very quickly. Rinsing twice and leaving it for a day is the way to go.
As a DIY gal, I've tried every shortcut in the book and they really
aren't worth it.
I guess I ought to be ashamed to admit it, but I have only vacuumed living
or bedroom walls before painting. That is if they had only air dirt. And I
have never had a paint job go bad. So maybe they do not need cleaning
solutions and rinsing before painting.
Like others stated, use TSP, but you don't need to rinse. I
wash with TSP using an old wash rag, wiping most of the
fluid off. I never rinse, and I never have paint failures.
How much you wash depends on how dirty the walls are. If
you have crayon marks and other such stuff you need to get
it off, but if it is just regular dirt that accumulates you
just wipe over it and scrub a little to remove finger
marks. I generally use about 1 gallon of solution for a
room and use an old wash cloth that is wrung out enough so
it doesn't throw water around; but my walls aren't very
dirty. The main purpose of washing for me is just to cut
the sheen a bit. If you have had renters, children, or other
people that are hard on the walls, then by all means wash
more carefully and let dry before painting.
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