On Nov 4, 9:21*pm, aemeijers wrote:
Jim wrote:

Brush with a stiff brush, clean with spray cleaner, and treat with
armor-all or similar.

Danger Will Robinson!!!

Don't use Armor-all unless you have a pair of golf shoes to wear while
climbing the stairs. (I've never tried it on stair treads, but I've
made the mistake of putting it on a motorcycle seat before. It made
riding "interesting".)