I invested in an infrared sauna early on in my diagnosis as over the long term, it was much more cost efficient than paying someone per use plus , having one at home of course means you are likely to use it more often. I aim to use mine every day where I can but at least 3 times per week. You can also buy portable ones which are less space consuming and less expensive. My sauna is a FIR infrared meaning it utilises infrared light on the far end of the spectrum, it is the FIR that is most useful for detoxing.

Heres some science on the detoxing benefits of infrared saunas:

Infrared saunas promote sweating, a natural detoxification process that helps the body eliminate toxins stored in fat cells, like heavy metals (e.g., mercury, lead) and certain chemicals (e.g., BPA, phthalates). FIR (far infrared) wavelengths specifically increase sweating and fat mobilisation, helping to reduce toxic burden and alleviating stress on detoxifying organs like the liver and kidneys.

It is extremely important to ensure you are detoxing if you are on conventional treatments such as chemo or radiation because these treatments, while often necessary, leave behind a significant toxic burden in the body. They leave behind metabolic waste, drug residues, and dead cellular debris, which the body must clear out. 

 Important to note is that you should wait 3 days post treatment before you start your detox protocol so that the drug/radiation can do what it is there to do.
And some added bonuses include :

Immune System Support: Exposure to infrared heat can mimic the effects of a mild fever, which is part of the body’s natural immune response to infection. This controlled “hyperthermia” can stimulate immune cells, including white blood cells and natural killer cells, enhancing the immune response.

When you use heat therapy such as infared saunas, your body produces special protective proteins called heat shock proteins (HSPs). HSP's are responsible for cellular clean up and repairs.
Cancer cells are often full of damaged, twisted, or misshapen proteins, which can build up and make things worse. HSPs either fix these faulty proteins or break them down and clear them out, so they don’t pile up and cause more harm.

HSP's also have the ability to switch on your body’s repair systems, boost natural antioxidants that protect your cells, reduce harmful inflammation & can help your immune system spot cancer cells, making your body more effective at attacking tumours. This has also been shown to make immunotherapy treatments work better.'
This can be achieved with regular use of an infrared sauna.