What causes thermal tracking stains?

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Tags

1. #caused
2. #tracking
3. #thermal
4. #appears
5. #activities
6. #warmer
7. #indoor
8. #walls
9. #moisture
10. #structural
11. #cause
12. #stains
13. #circulation
14. #other
15. #insulation
16. #appliances
17. #house
18. #problems
19. #condensation
20. #actually
21. #produce