How do I clean the harness straps and LATCH strap?
The harness straps and LATCH strap must be surface-washed only using mild soap and a damp cloth. They should never be immersed in water, as this may weaken them. If the harness straps or LATCH belt are frayed or heavily soiled, contact Graco customer service for assistance. (Page 7)
From the official Graco 4Ever DLX Car Seat manual, page 7
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