I wash wool and silk using a ph balanced detergent with no protease. I use cold water, minimum spin, and a super long soak. Then I hang dry. It's more work to wash this way, but they last longer, never smell, and 100% silk and wool only need washing 1/3rd to 1/5th as often anyway, so the total work is lower than with plastic clothing. The brand of detergent I use is literally called "Soak," and I get it on Amazon.

The clothing comes out great.

Can you tell us more about the soak phase or link to some reading on the specifics?

I do the other three things so I’m just curious whether I’m missing something essential.

I wash quite annoying knitwear that has on occasion shrunk when someone else has washed them or due to my mistakes.

I wash inside out in a clothes bag with no spin and cold water using a detergent for wool (e.g. Woollite, which may not be available where you are).

I dry (also inside out) on a heated drying rack on top of a thin pillowcase or a mesh for that purpose https://www.lakeland.co.uk/25293/dry-soon-deluxe-mesh-shelf-.... This speeds up drying despite the omission of spin, and takes about a day.

This has worked for at least a dozen cycles for a rollneck I quite like.