My youngest once came back from a few weeks in Thailand with a small backpack full of clean, ironed and sweet smelling clothes. He always has been keen on having everything washed, and said that there were plenty of laundries and they charged very little to do a kilo of laundry, so he used them, to support the local economy and to have clean clothes in that sweaty environment.
I prefer to wash when travelling, rather than lug huge cases of stuff around. I don't do it before I come home, though, I try to plan so that the last few days I use everything up and so I come home with a bag full of dirty linen.