Swabs were taken using Hygiena’s UltraSnap Surface ATP Test and EnSURE Touch monitoring system to determine RLU (Relative Light Units) results.
The RLU reading is based on the amount of ATP (Adenosine Triphosphate) collected from the sample. The relationship between the amount of ATP on the sample and the RLU result reading is simple: high contamination (improper cleaning) = large amount of ATP = more light produced in reaction= high RLU reading on EnSURE. Objects with an RLU reading of <50 register as a pass (clean), and objects with an RLU reading of >50 register as a fail (dirty).
The following twelve items were swabbed, at multiple locations, using 10 different reference points: supermarket trolley, takeaway container, remote, iPad, headphones, supermarket shopping bag, laptop, phone, doormat, keys, inside of a kitchen bin, and a toilet seat – for example, we swabbed 10 of each item (for example 10 takeaway containers), across a variety of locations. All of the objects that failed were summed to give a total fail count and a total RLU reading.
In addition, the following four makeup tools were also swabbed, using 10 different reference points: foundation brush, beauty sponge, eyeshadow brush and powder brush.