Washing work clothes in cold water - which detergent - anyone try Magnesium ?

Hi.....

whats the best detergent to clean work clothes of sweat and dirt and some oil ?

Regular washing machine but Cold water ,

I saw something from Japan called TerraWash  which is treated Magnesium pellets ,,
the pouch works for up to 300 washs but costs over $50 , which seems like a lot for 5 1/2 OZ  of this "Magic" stuff.

Any other tricks ?   Do the commercial laundries that clean shop uniforms  have any trick cleaners we can use at home ?

Thanks for your ideas

I usually put a little simple green in both the detergent and the bleach dispenser - it helps dissolve the grease and keep it suspended in the water so none is left behind to get deposited on the next load. I do wash my work clothes in hot, though. Do you not have hot water supplied to the machine you're using to wash your work clothes? It can really help get the grease out.

20 mule team borax. It's gotten me through everything from construction to car repair too fast food. 

I usually just add some vinegar and oxy to the normal detergant

Here is a video on the TerraWash magnesium pellets , 

https://www.youtube.com/watch?v=kVQomy4Zm94

other than the price it sounds  too good to be true , 

can I just throw some chunks of Magnesium VW case pieces into the wash :)_