I am doing a deep clean on a 5 bed ,3 bath house ,on Wed. the grout in the showers is a bit mouldy, what do you guys use to clean this,I have been using mildew and mould remover,but have seen some tales of people using mixes of white vinegar and lemon juice,and read somewhere else a guy uses a 50/50 mix of water and bleach.Comments welcomed.