If you have an oil based paint on your wood then i d clean them with tsp if you intend to repaint that wood.
Cleaning painted wood before repainting.
If you do use tsp then i would also clean the residual tsp off the piece of furniture with a clear water wash or denatured alcohol.
You can then sand the entire surface to give it a more textured surface that your paint will easily stick to.
Painted wood takes a little extra care to clean but that doesn t mean it s impossible.
Primer helps paint stick and improves the coverage so you can dramatically change the color of the old wood if.
In general it s not great idea to use water on your painted wood so dust frequently to keep from having to deep clean more than necessary.
But as long as you don t use water.
There are ways to safely clean your house before painting using a pressure washer including using lower psi pressure washers widening the spray and standing at least two feet back.
It is important to remove any flakes from the surface via sanding or scraping before repainting.
You want the absolute best adhesion surface for your paint.
This is also a good time to scrape any old flaking paint off and to sand down old paint lines.
When the wood is clean and smooth use a latex based primer especially made for exteriors to prepare the surface for a new coat of paint.
Before painting apply primer to the old wood surface whether it is indoors or out.
Here s how to take on the task.
Time is of the essence.
If mildew is a common problem on your exterior wooden surfaces consider repainting with a paint designed to prevent mildew.
Painting over cracked paint is a bad idea.
Paint cracking on walls and ceilings happens due to a variety of causes one of the most common being poor preparation of a surface prior to painting.