1. Place in jeans pocket. 2. Wash at 40 degrees for 2 1/2 hours. 3. Remove and place in (clean) cat litter for 2 hours. 4. Check to see if they are still working. 5. If the answer to 4. is affirmative,replace in jeans pocket when dry and breathe a sigh of relief. 6. If the answer to 4. is negative, go online to find a replacement before son discovers their fate. ETA. Do not try this at home! Luckily in my case no. 5 applied and son is none the wiser!