With me and number one son's oily overalls, I may well try it in the washing machine! :-D Back on topic, there are a number of Biological Radiator flushes available now. They seem to work extremley well. A friend used one of this type on a Nissan Bluebird that had coolant looking more like Black treacle, after a couple of hours the water was coming out clear. I'm now desperatley trying to remember the name of the product (NO Degsy, not Areil!) They also do a helpful web site.
Forte, thaa's the manufacturer!http://www.problemwithavehicle.com/