The sniff test may tell you if you wore enough deodorant but doesn’t always let you know when you need to wash your clothes. What you do, the fabric type, the wear and the weather all play deciding factors. The American Cleaning Institute offers tips to help determine if it’s time to wash those bed sheets, jeans, shirts, socks and underwear.

Here’s how often you should wash some of the more common items that need to be laundered.

Jeans: After wearing them 3 times

Bras: Wash after wearing 2-3 times

Coats: Once or twice per season

Sheets: Wash once every two weeks

Towels: After every 3-5 normal uses

There are a few exceptions. One is whites, which should be washed after each wear, as they are prone to discoloration. For more guidelines on when to wash your clothes and linens, check out the Laundry Basics Guide on the ACI website.