First off, it is important to point out one of the USP's of these products which is that the Peat-Fiber and merino-wool vaporize the moisture and sweat you may release while sleeping. This diminishes the need for washing, and hanging out the item to dry and air out will accelerate this vaporization-process.

It will depend on your usage if a daily or weekly ventilation will suffice. Such airing out is therefore a basic way of taking care of these items. In that manner the bedding can release the sweat and moisture absorbed during the night and thereby retain its function.

This means if such care is done on a regular basis, it is recommended to not wash it if it is not dirty.

The reason for that is also because the Comforter will require a Duvet-Cover and the Mattress Topper a Cover-sheet. Therefore, it will be a matter of washing the Duvet-Cover and the Cover-sheet and not the Comforter nor the Mattress Topper.

If washing turns out to be needed the care of peat products will be this:

It should be done exclusively by a professional (hand) wash at 30 °/ 86° Fahrenheit with the help of acidic detergents (about pH 6) without fragrances. Mild, sour detergent suitable for wool prevents too much humic matter from being washed out. Important is thorough rinsing and, with high water hardness, an addition of some vinegar in the last rinse water. Peat beds have a fungicidal action, preventing the growth of mold fungi.

Suggested is also not to put it in a dryer after washing, but lay it out on the floor on top of towels at room temperature.

Overall the extent of applicability of these suggestions will depend on what people themselves actually do as far as taking care of their bedding and of their bedroom.