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Are any written instructions to deal with accidental spilling of the Blessed Sacrament of Blood of Christ on the Altar or aisle?
Of course there are provisions written about such situations.
The General Instruction of the Roman Missal says the folllowing:
280. If a host or any particle should fall, it is to be picked up reverently; and if any of the Precious Blood is spilled, the area where the spill occurred should be washed with water, and this water should then be poured into the sacrarium in the sacristy.
A sacrarium is a basin with a drain that goes directly into the ground.
It is usual when mopping up any spillage on the floor, to absorb some of it with a cloth and squeeze the cloth out into a bucket. This continues until the floor is clean, even if a damp spot remains, and water is then rubbed over it to clean it even more thoroughly.
It is the same in the case you mention. The liquid and water are squeezed into the bucket and the result is poured down the sacrarium. The cloth used for this purpose must be washed in water until there is no sign of the stain, and the water poured into the sacrarium. The cloth may only then be put into the laundry basket. - What to do when the Precious Blood is spilt