Safe to run cleanup before repair?

[Joel Samuelsson]

So, I have a cluster which grew too large data-wise so that compactions no
longer worked (because of full disk). I have now added new nodes so that
data is spread more thin. However, I know there are incosistencies in the
cluster and I need to run a repair but those also fail because of out of
disk errors. Is it safe to run cleanup before I run the repair or might I
lose data because of said incosistencies?