How should I clean the harness straps and lower anchor attachment?
Surface wash only with mild soap and damp cloth. DO NOT IMMERSE THE HARNESS STRAPS, LOWER ANCHOR STRAP or TETHER STRAP IN WATER as doing so may weaken the straps. If harness straps, lower anchor strap or tether strap are frayed or heavily soiled, contact Customer Service at www.gracobaby.com or 1-800-345-4109.
From the official Graco 3- 1 Car Seat manual, page 117
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