Most stains are difficult to remove from siding. I have had partial success by combinations of pressure washing and sanding, but lots of work. Most likely you will need to use a solid color stain or paint. Solid stains are opaque and will cover any previous stain color, but have minimal film thickness and will allow wood grain and texture to still show. Semi-transparent stain will not cover the red stain, and will produce very uneven and muddy color.

Painting required coating with a stain-blocking primer and solid color topcoat. The range of color choices is greater, and durability is excellent, but you have to decide if a painted surface is what you are after. Paint or solid stain, you are still best served by obtaining the highest quality you can obtain from a mainstream paint manufacturer. Both can be spray-applied and back brushed for rapid good coverage, or conventional brush application.

When changing to a solid stain or paint, testing a smaller area for appearance and adhesion, before committing to the whole house is a good idea.

Thank you! Now I can shop for a new color.