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In what vicinity is this white powder forming or around?
Ok..have you noticed any coolant loss etc?
If your battery light is on..then it likely your alternator isnt charging..so you'd need to make an inspection of seeing if the belt is still intact and then test the charging system with a suitable multimeter to see if its charging or not..normally you should have a 13.5-14v charge... refering to the white powder..that can either be one or two things coolant,dried antifreeze or aluminium corrosion from the cylinder head/cover..
No problem..glad to help