our grey tank tends to get a bit whiffy while on the road and i was wondering if anyone has tried putting the aquachem pink, perfumed bowl cleaner stuff in the grey tank to combat the stink. i tried putting the plugs in the sinks and shower put it dont work. its fine on site no matter how full it is but the minute we move off it starts. cant always find a dump point on site so we have to find a layby with a drain or just suffer but it gets bad. once its empty all is pleasant and sweet.