Introduction: Paint Brush Sealed in Glass Jar With Thinner.

About: refrigeration engineer; M.O.D. trained; from Christchurch Hampshire[before it was removed to Dorset] moved to Eilat, Israel in 1987.
Using surgical rubber gloves to seal a brush soaking in the appropriate thinner although cellulose or thinner 21 seems a pretty good universal cleaner for paint or contact adhesive.

Step 1:

After adding thinner of choice seal jar with surgical gloves.2 seem sufficient.