Wool does not need to nor keep well if washed frequently. I hardly ever wash my wool clothing in the washing machine, since it is hard on the fibres and I want them to last long, considering the investment I made in money and work hours.
First of all, air your clothes at least once a year. Pull out everything and hang it freely so that the fresh air reaches into every crease and fold. This also prevents moth attacks. I let them hang for two-three hours.
Go over every garment and check for stains, holes, or ripped seams and fix them right away. Here is how I take out stains of food or drink on wool, with baby wipes or a moist cloth.
One thing that I almost always need to mend are my kneehose. They are patched several times and here is how I do that.
When I made them, I did think first and made the choice of making the soles in a steadier and thicker wool than the hose. Evenso, they do get a lot of wear. As you can see, both the heels are patched. One was so worn I simply cut the remains of the sole away and patched it with a new piece. The other one was not as bad so there I put a new piece on the inside and stitched it thouroughly.
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And this is the result, a nice piece of patchwork and my hose are ready for another season. These hose are now about seven or eight years and I wear them on almost every event I go too.
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Now I just need to pack everything away again, hopefully in some kind of order, and finally hem that dress I made in December...