Compositions of and methods for using synthetic retinal derivatives as retinoid replacements and opsin agonists are provided. The fabrics may be surface coated when they are individual fibers or strands 4, bundles of strands, formed fabric or combinations therefore. The position of the end portion is determined within a pre-defined range of access, then the joint angle of the intermediate portion is fixed, and the position of the intermediate portion is determined from the angle of rotation about the axis connecting the fixed portion and the end portion. Drain size and queue size values are determined for each of the queues to which PHBs are mapped. The duration of the step is from about 60 to about 180 seconds. The plurality of pads include first pads having a first surface area and second pads having a second surface area, the second surface area being substantially larger than the first surface area.