Dissociatives Best ROA for MXPCP? (+ some others)

[isotuden]

I have heard this stuff is caustic, and that things like IN or rectal use are not advised, is this true? If so, I imagine the best move would just be to stick to oral

Also, for those who have tried 3,4-MD-PCP or 2-FXiPr, what are the best ROAs for those?