Save the trigger!!  Our bottles and trigger heads are really good quality and can be reused.  Due to the pandemic there is a world shortage of trigger heads and packaging.  Please don't throw them away, think of the planet and use our Concentrated Cleaners as refills Fenwicks Black Streak Remover will easily remove black streaks, green algae, road traffic film, diesel fumes, and over wintering grime, etc. It is suitable for cleaning plastics, aluminium, GRP, ABS, fibreglass, decals, sealants and much more. Can be used on arrival at campsite for waterless spot cleaning of travel grime.Direction For UseStep 1: Apply to surfaces from bottom to top.Step 2: Allow 1 to 2 mins to soak in, but do not allow to dry.Step 3: Agitate with a sponge or soft brush.Step 4: Rinse thoroughly with water from top to bottom. For a showroom finish just add Fenwicks Bobby Dazzler to the rinse water.Handy hintsFenwicks Black Streak Remover can be made by diluting Fenwicks Caravan Cleaner or Fenwicks Motorhome Cleaner to a 1:10 solution with clean water.  Use the fill level mark at the bottom of the bottle to add the correct amount of Cleaner.To keep black streaks away for 3-6 months, dip a soft bristled tooth brush is some Fenwicks Black Streak Remover and gently scrub the rubber seals around windows, hatches and gutters, being careful not to scratch the windows, this will create a lot of black run off, dont worry it is only the oxidised rubber that creates black streaks, repeat process until the run off is clear. Happy days ! .