Clearing A Variable Of User Defined Type

I am currently working in an application in which I use the following user defined types:

Public Type correlationstruct
corr As Variant
corrstd As Variant
lower As Variant
upper As Variant
support As Variant
End Type

I have a public variable called myctafund, of type ctafund:

Public myctafund As ctafund

My problem is the following: When I need to update myctafund, I first want to clean it entirely before putting new values, so as to be sure older values do not stick around (I do not necessarily overwrite all the values of the mycta type).I can't figure out a way of clearing the entire myctafund variable in one shot. I tried:

myctafund=empty

but I am granted by a nasty excel error. I'd like to avoid writing 200 lines of code just to clean the entire variable.