Performance counters are not always removed when APM is disabled

On several occasions I've noticed that even after:

1. removing a server from the target group of all APM management packs
2. waiting until IISReset is required
3. doing the IISReset

still some .NET APPS performance counters linger on or maybe gets recreated when load (out of my control) hits the server.

Profiling the IIS process using Visual Studio I see no use of PerfMon64, so I looks like APM is disabled on the server, but why isn't the performance counter(s) gone?

Thanks

Michael Brandt Lassen