Well, I didn't get any responses to my post a couple weeks ago about how to clean the lavender suede lining of my Kooba, so I decided to just try some things and see what worked.
The inside of the bag I was dealing with started out with some hair and crumbs/lint, a large purple-ish stain the size of a quarter on one pocket, severe darkening at the bottoms of the inside pockets (*almost* looked like mildew but fortunately wasn't), makeup stains, lipgloss stains, and an overall dinginess darker in some spots than others. In other words, pretty gross. (This bag was sold as "new without tags, btw. :lolots
First of all, I vacuumed out the bottom and pockets. This removed the crumbs/hair. Then I used some antibacterial hand wipes to scrub at the worst stains a little bit. This took away much of the major residue. Then, since in this bag the lining can be pulled out of the body of the bag, I hand washed the lining with warm water and antibacterial dish soap. This was a little tricky, because the tops of the pockets and the top of the zipper pocket are lined in black leather, and I didn't want that to bleed. I held it over the water and scrubbed the bottom part of the lining thoroughly, then used a washcloth to scrub the areas closest to the leather so they were never dipped in the water. They did get wet, but fortunately I didn't have a problem with bleed at that point. I rinsed the same way (twice) with clean water.
Drying was tricky. I left the lining pulled out of the bag to dry it, and used several old small towels to stuff inside the pockets and around the edges of the leather to keep the leather portions from touching the wet lining. This turned out to be crucial because on the one area where I missed and part of one handle touched the lining while drying, it left a black smudge.
The makeup stains did not come out with the washing, so I used some isopropyl alcohol (rubbing alcohol) on a cotton ball and blotted those stains away while the lining was still partly damp. While it was drying, I "fluffed" the lining a few times and rubbed gently with a towel, and the nap of the fabric seems to have returned just fine.
Overall, not all the darkening came out of the lining. It still doesn't look new, but it looks TONS better. It is nearly stain free with just a couple of dark spots, and at least now I know it's really CLEAN. I plan to go back around the edges and inside the exterior pockets with those anti-bac wipes, because that seemed to work really well.
Hope this helps someone else fix up a sad bag!