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devilstang t1_j63rr9y wrote

They make bottle brushes you can clean them with. It’s not that hard.

5

Verifiedvenuz OP t1_j63rxo9 wrote

Most bottles are really hard to see inside unless they're clear (In which case they're likely plastic)

3

lasdue t1_j6453pn wrote

I just put a tab of coffee machine cleaner into my stainless steel bottle and fill it with hot water. After a while I pour half off, close the lid and give it a shake. It'll be clean enough after that.

5