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If you have the ability, build in a free afternoon mid-way through your trip and find a local laundromat (unless your accommodation has self-wash facilities.)
That way you can pack for a week and then re-wear your clothes.
If there’s no laundromat I sometimes use a laundry bar and do a few things every other day in the sink and hang to dry.
You can use “Sink Suds” if you’re doing multiple pieces in the sink.
Or a laundry bar like Ethique.
Just cut off a small amount to take with you.
(I find the bar easier if I’m only doing a couple of pieces.)