Hello.. Some thoughts from a fairly new Very Hard solo survivor.
Cleaning:
Allow players to wash themselves by lakeside without actually having to dive in and risk hyperthermia. I understand not to 100% but possibly to the 40% I was able to achieve by jumping in the water. Maybe to 20% with the use of soap. The game dropped me in the start of winter and just haven't found a way to wash the stank off other than when it rains or completely submersing myself in the freezing water. Even with fairly clean clothes I end up very smelly soon after washing up.
Or another route could be filling the sink and/or bucket with the lake water and washing by hand. It could achieve at least 40% with just the water, and more with the use of soap.
Washing:
Would be nice if we could hand wash our dirty clothing by way of lakeside or sink/bucket as well. Say to 40% with just water and 20% with detergent. Constantly swapping new clothing is pointless when you can't wash off the stank and the clothing becomes 100% dirty soon after changing into them.
Drying:
To add to the cleaning/washing process, it would be cool if by standing next to a campfire/fireplace it would dry off you and clothing much quicker. Also being able to speed up the clothes drying by placing them into the campfire/fireplace inventory, with the chance of burning the clothes if not paying attention by leaving the clothes in for too long.
Temp:
Reduce the temperature swing from outside vs inside transition. It's a little weird that I have to search around indoors in my undies in the middle of winter with snow on the ground. A cabin with no electricity, nor any heat source, would be almost as cold inside as the outside temperature. Having to disrobe/change clothes each time I go indoors, which is frequently, becomes a PITA. And having ADHD I forget most of the time and either overheat, or freeze before I notice.
Other than those few things I've been enjoying the survival mechanics. Nice job.