Time used cleaning is part of the standard overhead and (IMO) in the same category as "house" rent, electricity, book keeping and everything else that goes into running a company.
Just as a different way of thinking, IMO there is no standard overhead.
Everything you do has a purpose and that is shipping product and should be charged for.
If it does not add value why do you do it?
Once you see it as a direct cost in you pricing you may look further into "Why do I have to clean up afterwards?". Just like a faster toolpath or higher cutting speeds, maybe there is a faster way to get it all done. Throw it into overhead and you won't attack it.
Do enough of this and your pricing will be 50% "overhead".
I most certainly charge for receiving, shipping, quoting, AP and AR time as each order results in more work to be done.
Yes the office rate is way lower due to power, machine and tooling cost, but I still pay people to work in the office.
The advantage to a system like this is that you increase the heck out of your billable hours.
Since you will have a fixed nut to crack more hours mean lower rates as you do not load your machines with some absurd "overhead" charge.
Adding overhead to your machines distorts your real incremental cost leading to dumb decisions to outsource basic stuff you should be doing in-house.
Bob
) requires very careful, (bordering on anal) cost analysis.