Finding all the .svn directories is easy

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$ find . -type d -name .svn
./.svn
./sourceA/.svn
./sourceB/.svn
./sourceB/module/.svn
./sourceC/.svn

Now use command substitution with rm -rf.

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rm -rf `find . -type d -name .svn`

Note the use of the backtick symbol (located under the ~ on the English keyboard)—that is not a single quote.