madalas siguro ma-trauma kapag nililinis, dahil medyo matulis.
even the softest basahan + abrasive shine product, can wear away paint, if used often enough.
remove rust using fine sandpaper.
apply rust converter (serior citizen here; only turco comes to mind).
paint. puedeng manual apply kung maliit lang naman at acceptable to you. otherwise, let the professionals do it for a fee.
good luck.
Sa ganyan pin point retouch, toothpick gamit ko pang apply ng paint, dab dab. Kung galing sa Pylox spray can, spray muna kaunti sa paper cup, tapos dip ang toothpick.