By the way, I've now discovered why people put hekhshers on soap. These guys eat it!
R' Yaakov M. Eisenbach prefers lemon soap because it's good in salads. http://www.youtube.com/watch?v=oVddVIpTH6M&t=1m11s
Also, watch out for making your romaine too soapy or you'll be blowing all day http://www.youtube.com/watch?v=oVddVIpTH6M&t=2m45s
In response to 'why don't you just wash it?' http://www.youtube.com/watch?v=oVddVIpTH6M&t=3m53s 'just a little suds in here'. and rinse off the soap at the end, if you prefer http://www.youtube.com/watch?v=oVddVIpTH6M&t=9m35s
