There is a google spreadsheet and a script that generates PDF files with the information of the spreadsheet, the PDF files are automatically saved in a folder of google drive. How could you erase the PDF files in that folder? Attachment code.
function Hojascalculo() {
var sheetName = "HOY";
var folderID = "123456789"; // Identificador unico de carpeta.
var pdfName = "Informe salidas dia "+Date();
var sourceSpreadsheet = SpreadsheetApp.getActive();
var sourceSheet = sourceSpreadsheet.getSheetByName(sheetName);
var folder = DriveApp.getFolderById(folderID);
//Copia hoja de calculo
var destSpreadsheet = SpreadsheetApp.open(DriveApp.getFileById(sourceSpreadsheet.getId()).makeCopy("temporal_pdf", folder))
var sheets = destSpreadsheet.getSheets();
for (i = 0; i < sheets.length; i++) {
if (sheets[i].getSheetName() != sheetName){
destSpreadsheet.deleteSheet(sheets[i]);
}
}