Steve Walker wrote in
:

Acquired a LOT of HO scale slot car track recently. The rails and end
connections are rusty, some very little, others, a lot. Need
recommendations on the best, non-abrasive way to remove this, without
damaging the styrene track itself. Preferably non-toxic.

Find some Evapo-Rust

It's available at soem better hardware stores, AutoZone, & Harbor Freight.
Shop around, prices tend to vary considerably.

Afterward, rinse with denatured alcohol.

Doug White