Blitz That Mould Remover Spray 500ml 4 "Good Product, Bad Spray Gun" Mr Box 21 April 2018 Excellent for removing black marks in the grouting of tiles. The manufacturer changed the spray gun about a year ago and the new gun breaks after you have used about a quarter of the liquid. This is the second consecutive time that the gun has broken! A note from the team Thanks for taking the time to write your review. I'm sorry top hear of the problem you've had with the trigger, I'll be sure to pass your comments to the buying team.