MAKE SURE ITS NON CAUSTIC IF YOU ARE GOING TO USE ON CONSERVATORIES ETC,
AL
Don't get hung up on it being caustic or not, I've been assured by the suppliers that its fine to use as long as it's diluted and used as per instructions.
It is after all used on vehicle bodywork and that includes all maner of plastics/rubber/metals.
As I've said I've been using this over 2 years now and not 1 con roof has melted....yet!