Larry if the soot residue is that bad I suppose vacuuming could help, but no we usually don't do that.
Items that are soot stained are sorted as to if salvageable. Some synthetics that receive too much heat my not be worth processing unless they have sentimental value.
You can do presoaking of laundry items in a degreaser overnight, if the items have a value that makes it cost effective to do so.
As far as an Ozone room, any room can be used as an Ozone room. The smaller the better, Ozone is heavier that oxygen so it falls to the ground until levels build up. You can place your unit on a shelf up high or you can use a ladder and secure it to the top with a bungee cord.
Spread the items out, on the floor if necessary, use a fan on low to help circulate the ozone. Ozone does not penetrate well so you may need a second application. It's better to do have two treatments than one treatment too strong.
Ozone is damage the rubber in elastic if you expose it to too high a concentration for too long of time.
We usually do a 6-8 hour time and then check it in the AM.
Local drycleaner.