Fill a garden sprayer with a solution of 1/4-cup white vinegar per quart of water and spray the chair liberally. Allow the solution to sit on the chair for 20 minutes; then rinse it off with a garden hose. via
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How can I make my chair cushions firmer?
Remove your cushions and clean the couch.
Unzip the seat cushion cover and pull out the insert. Measure and cut foam to fit.
Use spray adhesive to attach foam to cushion.
Insert cushion back into the cover.
Unzip seat back cushions. Add Polyfil until they are fluffy. Re-zip.