Well dear Myst
You already have the main part of the answer you request about machines...
Before 2 days my girlfriend had a frog-doll in her palms,which had bought before months...
This frog has a small mechanism with battery for the reason to produce frog-like sounds...
The batter run out of energy before a month...
While she was holding it she told me that she noticed that the frog...absorbs Reiki!
After 5 mins the frogy started to make some noises but in slow motion...
We decided to experiment with it,so she gave Reiki to it for 10 more minutes after I gave for other 10 minutes...
Suddently the frog started to make sounds normaly and without the needed presure on its back were the triger is!
Reiki is a kind of energy which frequencies are very close to these of the electric energy...
It is recomented to charge with Reiki food,water,medicines and and personal items even if they were shampoo or creams for body care or if they were jewelery etc...
Reiki does enhance the properties of everything,it also cleans things and rooms from negative energies...
There are many ways to clean a room or an object with Reiki, it will help us more if you tell us at which level of which modality are you at this time... 
The more simple way is to hold the object between your palms and start the Reiki flow with the intention to clean it! If the object is too big or you would like to clean a room then just visualise it between your hands!
You will notice that Reiki flows for such cases too!
And it works...
Light and Joy!