A portable liquid-recycling liquid-reusing cleaning system for use in cleaning hard surface flooring, comprising: a trolley bucket assembly including: a bucket operable to hold cleaning liquid; a wheeled chassis; and a spigot fluidly connected to the bucket, the spigot (62, 158) including a valve that is adjustable throughout a range from a fully open position to a fully closed position, whereby when the bucket contains cleaning liquid, a user may dispense and regulate the flow of cleaning liquid from the bucket through the spigot by manually adjusting the spigot (62, 158); a vacuum recovery tank positioned on the trolley bucket assembly, the vacuum recovery tank operable to hold cleaning liquid and soil, the vacuum recovery tank including a bottom wall and a vacuum recovery inlet, with the vacuum recovery tank bottom wall including an interior surface; and a vacuum motor assembly fluidly connected to the vacuum recovery tank; characterised in that the vacuum recovery tank includes a cleaning liquid transfer outlet through which cleaning liquid from the vacuum recovery tank may be transferred to the bucket for reuse, the cleaning liquid transfer outlet including a cleaning liquid entry opening through which cleaning liquid from the vacuum recovery tank enters the cleaning liquid transfer outlet, with the cleaning liquid entry opening of the cleaning liquid transfer outlet positioned above at least a portion of the vacuum recovery tank bottom wall interior surface, thereby inhibiting soil that settles on the portion of the vacuum recovery tank bottom wall interior surface from passing through the vacuum recovery tank cleaning liquid transfer outlet; whereby a user may dispense cleaning liquid from the bucket through the spigot onto hard surface flooring, may vacuum dispensed cleaning liquid and soil from hard surface flooring through the vacuum recovery inlet into the vacuum recovery tank, may transfer recovered cleaning liquid from the vacuum recovery tank through the cleaning liquid transfer outlet to the bucket for reuse, and may dispense transferred cleaning liquid from the bucket through the spigot onto hard surface flooring. a trolley bucket assembly including: a bucket operable to hold cleaning liquid; a wheeled chassis; and a spigot fluidly connected to the bucket, the spigot (62, 158) including a valve that is adjustable throughout a range from a fully open position to a fully closed position, whereby when the bucket contains cleaning liquid, a user may dispense and regulate the flow of cleaning liquid from the bucket through the spigot by manually adjusting the spigot (62, 158); a bucket operable to hold cleaning liquid; a wheeled chassis; and a spigot fluidly connected to the bucket, the spigot (62, 158) including a valve that is adjustable throughout a range from a fully open position to a fully closed position, whereby when the bucket contains cleaning liquid, a user may dispense and regulate the flow of cleaning liquid from the bucket through the spigot by manually adjusting the spigot (62, 158); a vacuum recovery tank positioned on the trolley bucket assembly, the vacuum recovery tank operable to hold cleaning liquid and soil, the vacuum recovery tank including a bottom wall and a vacuum recovery inlet, with the vacuum recovery tank bottom wall including an interior surface; and a vacuum motor assembly fluidly connected to the vacuum recovery tank; characterised in that the vacuum recovery tank includes a cleaning liquid transfer outlet through which cleaning liquid from the vacuum recovery tank may be transferred to the bucket for reuse, the cleaning liquid transfer outlet including a cleaning liquid entry opening through which cleaning liquid from the vacuum recovery tank enters the cleaning liquid transfer outlet, with the cleaning liquid entry opening of the cleaning liquid transfer outlet positioned above at least a portion of the vacuum recovery tank bottom wall interior surface, thereby inhibiting soil that settles on the portion of the vacuum recovery tank bottom wall interior surface from passing through the vacuum recovery tank cleaning liquid transfer outlet; whereby a user may dispense cleaning liquid from the bucket through the spigot onto hard surface flooring, may vacuum dispensed cleaning liquid and soil from hard surface flooring through the vacuum recovery inlet into the vacuum recovery tank, may transfer recovered cleaning liquid from the vacuum recovery tank through the cleaning liquid transfer outlet to the bucket for reuse, and may dispense transferred cleaning liquid from the bucket through the spigot onto hard surface flooring.