Chemicals on Morning Glory seeds

My cousin and I are planning on trying out Morning Glory seeds. I know about the chemicals that the seeds are coated with and that you need to remove it avoid the sickness/vommiting. What would I need to wash it with? Soap and water doesn't really seem like it would remove any chemicals, but I'm not sure.
Also, what dosage would be recommended for me? I'm about 6'0 and 170 lbs.
Erowid says 400+ seeds for a heavy trip and that's what I'm wanting to experience. I've done other psychedelics before so I'm not going to be tripping for my first time. I was planning on taking 400 seeds for me and 400 for my cousin. We were going to wash them off, grind them up, chug them with liquid and try to get over any bad taste.

 

sorry, i fucked up and accidentally made two threads when editing something.
disregard this thread and reply to the other one.
sorry for fuckin it up.

 

just buy organic ones

 

Everyone i've seen chug MG slush has thrown there guts up. Organic ones off the net is the best bet, not that crap in the walmart garden section. And have some bud around for the cramps/nausea and for a catalyst.