Curious what kind of detergent you have found to be most effective for doing laundry in sinks? I'm aware of Woolite, but presume that's not what you're talking about?
I once had a waiter drop a dish of spaghetti and meatballs in my lap. I was on the road without an appropriate change of clothes. A fellow minimalist traveler gave me his Dawn dish soap and it worked so well that that's all I use now when traveling.
do you pack a little bottle of dawn in your bag? Do you use it as a general detergent, or do you use it to spot-clean stains? I love this idea, just curious about the logistics.
I keep it in a 4oz generic plastic bottle and I use it as a general detergent. A little goes a long way, it's really effective for general cleaning. If used for a stain, I just pour directly on as needed.
I prefer dish liquid detergent; never pods or machine powder detergent, it is not good for your skin. Disclaimer: I worked for one of the biggest manufacturers of household detergents. Warning: too much liquid detergent may get you in trouble on airports.
The only caveat I'd give on liquid dish detergent is it's often way... bubblier. Rinse it extremely well, or you'll start getting small foam/slickness when you sweat(from personal experience in a soft water area, sadly).
I just carry whatever powdered detergent is available locally. I've tried the camping strips but I don't really see the point for my use cases. The powdered stuff does seem to set off airport scanners in the US if you have too much of it.
They sell dry laundry detergent sheets, put one in a dry bag along with your clothes and fill it with hot water. Then you can close the dry bag and agitate the whole thing really easily in a bath tub.