Deleting a rule defined by tellsimpafter

Hi All

If I have defined a rule, such as:
(C38) disprule(delrule2);

(D38) 		    DELRULE2 : DEL(w) -> - DEL(v) - DEL(u)	

how do remove it?  remrule seems to be the appropriate function, but I
have no idea what to pass as its first parameter.

Thanks
Neilen
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