IPA: /ˈrɪnsər/
KK: /ˈrɪnsər/
A person or device that rinses something, usually to clean it by removing soap or dirt with water.
The rinser helped to clean the dishes after they were washed.
Rinser → It is formed from "rinse" (from Old French *rincer*, meaning to wash or cleanse) and "-er" (meaning a person who). A rinser is a person who rinses or washes something.
Think of someone who is 'washing' ('rinse') something — the '-er' just means a person. A rinser is someone who rinses.