This is a guest blog post kindly written by Mark Beardmore, one of our regular contributors and longstanding detailing enthusiast. Mark is an experienced detailer and has tried and tested many new products as they come to the market. For this car tyre dressing review, Mark has thoroughly tested and reviewed two car tyre dressings from well known manufacturers; Poorboys Bold n Bright Tyre Gel and Pinnacle Black Onyx Tyre Gel.