Oncelet Guides: How Often to Replace and Clean Things

Short, sourced guides about the things you only do now and then: how often to do them, and how long things last.

How often should you replace it?
Toothbrush, sheets, furnace filter, contact lens case, smoke alarms and more, with the official source for each.
Things that expire that you forget about
Sunscreen, mascara, child car seats, tyres and carbon monoxide alarms: how long they last and how to read the dates.
How often should you wash towels?
Bath towels at least weekly, washcloths twice a week, and why kitchen sponges are better replaced than cleaned.
30 things worth tracking with a days-since counter
Home, health, car, tech and people: ideas for your board, with real intervals where they exist.

Oncelet guides