Hi,
I take it you are referring to the thresholds on the edge of the steps. Internal stairs.
Most are plastic and depending on the quality sometimes also have a metal bar.
A general cleaner will be fine, normally we just mop or wipe them with a damp cloth.
Obviously if they are really dirty and tick you will need to use a degreaser. If they have bubble gum on them just scape it off.
regards
Dave