Hi Sandra - yes, clearing energy at these sites is often essential - there's frequently such a mixed bag. It's something we do a lot of on the facilitator program - creating portals either to compost the energy or else realign it. I find obsidian works really well to help take dense energies away.  I use it to connect into the galactic core and take the energy there.

And yes - self cleansing is essential afterwards!

Much love

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