Related Clues:

• Etcher's purchase
• Low pH
• Sulfuric or hydrochloric follower
• Type of rain
• Corrosive chemical
• See 48 Across
• Dropped stuff
• Like a rude remark
• Car battery component
• Cause of some bellyaching
• Nasty, as a remark
• Corrosive compound
• Low-pH liquid
• LSD or HCl
• Battery filler