how to remove old silicone sealant

{"cid":"91219429","title":"white Color Neutral Cure Silicone Sealant 300ml For Glazing All Kinds Window","imgUrl":"https:\/\/img.chinax.com\/nimg\/c8\/f1\/5e139fca4a8d3372bb5ef4e4a0b6-200x200-1.jpg","attrs":{"Price":"Negotiation","Brand Name":"KINGDELI","Model Number":"HY723","Minimum Order Quantity":"720","Delivery Time":"7-25 days","Certification":"ISO9001:2008","Place of Origin":"CHINA","Payment Terms":"L\/C, T\/T","Supply Ability":"66000tons annually","Packaging Details":"plastic cartridge, aluminum foil","Application":"Door And Window","Tack-Free Time":"20 to 30 minutes","Color":"white","Type":"Flame Retardant silicone sealant","Main Raw Material":"Silicone","Package":"300ml","Component":"One Component","Shelf life":"12 Months"}}

{"cid":"91224864","title":"Customized External Waterproof Silicone Sealant For Pool Edges Fountains Pond Sealing","imgUrl":"https:\/\/img.chinax.com\/nimg\/af\/ae\/b050778fc454fe27ebe286e7e6aa-200x200-1.jpg","attrs":{"Price":"Negotiated","Brand Name":"shuangyuan","Model Number":"SY-9800","Minimum Order Quantity":"1200PCS","Delivery Time":"7-10DAYS","Certification":"MSDS; ISO9001; RoHS; CE","Place of Origin":"Guangdong, China","Payment Terms":"L\/C, D\/P, T\/T","Supply Ability":"48000PCS PER MONTH","Packaging Details":"Inside plastic bottles, outside carton box","Product name":"Weather Resistant Silicone Sealant","Main Raw Material":"Silicone","Usage":"Construction, Fiber & Garment, Packing,","Classification":"Other Adhesives","Color":"Transparent\/Black\/White\/Grey (customizable color)","Application":"curtain wall, sun room, aluminum-plastic panel, etc","Operating temperature":"-5\u00b0C to 40\u00b0C"}}