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Don't "let it go". 3 feet of land ended up costing us $60,000 dollars and the horrific experience of 2 years in court. Adverse Possession is one of the most ridiculous, insane laws in the world. All you need to do is write a letter to your neighbor like the following:
Dear Neighbor, it is my understanding that our fence is 3 feet on our side of the property line. We did this (or predessessor in title did this) out of convenience. You are welcome to use this portion of the property and maintain plants/grass. We reserve the right to maintain any plantings to our standards. We will provide you with notice if we want any plantings removed.
Send it to the neighbor AND the county (or whoever manages titles) registered, return receipt. Now you have proof that there is no "hostility" which stops the clock on adverse possession. If it has gone past the statutory length of time (10 years in WA), you are screwed and you should just give up.