Letter to the HOA's property management firm - A Suburbs Boy Living a Country Life
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Letter to the HOA's property management firm|
Your best bet is to do exactly as you've done.
If need be, you can post a nice little sign that says "Unauthorized vehicles will be towed".
And you could drop in one more time before your new tenants take possession, and call another tow truck if need be - just to be sure folks 'get it'.
But after your tenants move in, it's their problem to enforce, really.