Concrobium looks like some cool stuff Dave ...that being it's non toxic 

looks like it'll cost 9.99  from manufacturer
where as the zep formula was only 3 bucks
household bleach is only 5% strength where as swimming pool chlorine is
like 99% strength  and is some real nasty strong stuff  burning  holes
 in clothes quite easily... i got some splashed in my eyes once 

i've never run faster in my life to a sink