Hi chris ! morning
and that is not - morning chris are you smelling hi ?
Your analysis of de washing problem is v v v near
the Economic Order Quantity (EOQ)
I liked it - as you had almost come to the same conclusion
https://en.wikipedia.org/wiki/Economic_order_quantity
The analysis is almost the same - I think you just tweak a few nouns/names/labels - you arent selling the stock but using/consuming it. The inventory stock is the laundry basket
see what you think
At present since my thermostat is bust I am freezing dog bowls of water and putting them in the fridge - and yes skimmed milk lasts much longer than full doo-dah
and I havent quite got the economic quantity for that one ( spacing when to buy a pint or quart and minimising the going off rate and minimixing the number of visits to the supermarket)
has anyone else found the going off rate for milk is wildly variable in summer ( because the supermarkets store it out the back wivvart refrigeration) ? heat-shock it - we food technologists say