Recent investigations into spin ice suggest excitations that behave like magnetic monopoles, this has included a transverse field muon experiment. When zero field muon measurements are performed a temperature independent relaxation is observed at low temperature. Other techniques that measure spin fluctuations on either side of the muon time window see a thermally activated component below 2K, leaving open the possibility the muons are not merely a passive probe of the spin fluctuations. Indeed a recent theoretical paper has proposed the possibility of muon diffusion masking the spin fluctuations at low temperature. We would like to test this hypothesis on non magnetic analogues of spin ice. This proposal is of general interest to the frustrated magnet community as many sample show a temperature independent relaxation rate at low temperature.