It's also worth pointing out to your customer they will return.
I had to break this 'good' news to a customer a few weeks back.
A 3 storey house, only 2 years old, £450k and every wall, down the stairs suffered with a couple of lines across the landings for good measure.
I told them the only way to solve this (other than to vacuum the edges every day) was when the time comes to renew the carpets, get them lifted, seal all along each and every skirting board, and make sure the carpet fitters put down some thick paper over anywhere where they is the slightest gap.
